Australian GST Calculator (10%)
Use this quick tool to add GST, remove GST, or find the GST component from any amount in AUD.
GST Exclusive:$0.00
GST Amount:$0.00
GST Inclusive:$0.00
How GST works in Australia
GST stands for Goods and Services Tax. In Australia, the standard GST rate is 10% and applies to most goods and services sold by registered businesses. If you are running a business, creating invoices, lodging BAS, or checking supplier bills, it is important to know whether a price is GST-inclusive or GST-exclusive.
This GST calculator helps you do the math instantly so you can avoid manual errors and keep your pricing clear.
What this calculator can do
- Add GST: Start with a GST-exclusive amount and calculate the total including GST.
- Remove GST: Start with a GST-inclusive amount and extract the pre-GST value.
- Find GST only: Identify just the GST component from inclusive or exclusive prices.
- Use custom rates: While Australia uses 10%, you can test other rates if needed.
GST formulas you should know
1) Add GST to a price
GST amount = Exclusive price × 10%
Inclusive price = Exclusive price + GST amount
Example: $100 exclusive → GST $10 → total $110 inclusive.
2) Remove GST from a total
Exclusive price = Inclusive price ÷ 1.10
GST amount = Inclusive price − Exclusive price
Example: $110 inclusive → exclusive $100 → GST $10.
3) Calculate GST-only from inclusive amount
GST amount = Inclusive price × 10 ÷ 110
This is useful when a bill shows only a total and you need the GST share.
When people use a GST calculator
- Preparing invoices and quotes
- Checking supplier tax invoices
- Splitting expenses in bookkeeping software
- Estimating GST payable for BAS periods
- Comparing gross vs net pricing for products and services
GST calculator Australia: quick tips
Always confirm if a price includes GST
In contracts, online listings, and wholesale quotes, prices may appear in different formats. A common source of mistakes is assuming a figure includes GST when it does not.
Round carefully
In accounting workflows, cent-level rounding can affect totals across many transactions. Keep a consistent method in your invoicing and reporting tools.
Use this tool for checks, then record in your system
A calculator is excellent for validation, but your accounting platform should remain the source of truth for official records.
Frequently asked questions
Is GST always 10% in Australia?
The standard GST rate is 10%, but not all goods and services are taxed the same way. Some supplies may be GST-free or input-taxed.
Can I claim GST credits?
If your business is GST-registered and you have valid tax invoices, you may generally claim input tax credits on eligible purchases.
Is this calculator official tax advice?
No. This is a practical estimation tool for education and planning. For legal or tax advice, consult a registered tax professional or the ATO.